CN111305832B - Method for detecting fixed volume in carbonate reservoir by using radioactive oleophilic particles - Google Patents
Method for detecting fixed volume in carbonate reservoir by using radioactive oleophilic particles Download PDFInfo
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- CN111305832B CN111305832B CN201811516976.9A CN201811516976A CN111305832B CN 111305832 B CN111305832 B CN 111305832B CN 201811516976 A CN201811516976 A CN 201811516976A CN 111305832 B CN111305832 B CN 111305832B
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Abstract
The invention discloses a method for detecting a fixed volume in a carbonate reservoir by using radioactive oleophilic particles, which comprises the following steps: in the acid fracturing modification process, mixing a detection solution and injecting the detection solution into a shaft to perform acid fracturing on a carbonate reservoir, wherein the detection solution comprises radioactive oleophilic particles; measuring the radioactivity intensity distribution of the radioactive oleophilic particles around the well bore when the oil well production is reduced below the industrial oil flow; and identifying the distribution azimuth, depth and longitudinal and transverse scales of the oil-containing volumetric body in the carbonate reservoir according to the measured radioactivity intensity distribution result. The method is simple, convenient and feasible, low in cost, accurate and reliable, can help the oil field to accurately detect and identify the distribution condition of the oil-containing volumetric body in the carbonate reservoir, further adopts methods of directional fracturing, adding a temporary plugging agent to change the direction of a crack and the like, efficiently and accurately communicates and develops the oil-containing volumetric body, and improves the yield of an oil well and the recovery ratio of crude oil.
Description
Technical Field
The invention belongs to the field of petroleum engineering, and particularly relates to a method for detecting an oil-containing karst cave constant volume body in a carbonate karst cave reservoir in a northward oil field, a Tahe oil field and other complex reservoirs mainly comprising carbonate karst cave reservoirs by using radioactive oleophilic particles.
Background
As the oil and gas reserves of the carbonate reservoirs account for about 50 percent of the total oil and gas reserves all over the world, the oil and gas yield of the carbonate reservoirs accounts for more than 60 percent of the oil and gas yield all over the world, and the carbonate reservoirs occupy important strategic positions in the global oil and gas production. Oil and gas fields in various areas such as Sichuan, Ordos, Bohai Bay, Tarim, Tariver, northward and the like in China are mostly marine-phase and lake-phase carbonate rock oil and gas reservoirs, and are main battlefields for oil and gas development in China.
The oil and gas storage in carbonate rock oil and gas reservoirs is different from conventional oil and gas reservoirs, and the storage spaces mainly comprise natural fractures and corrosion cavities in reservoirs and karst cave spaces (also called constant volume bodies) with the vertical and horizontal scales of several meters, dozens of meters or even hundreds of meters. Particularly in the oil field blocks of the northward side, the Tahe and the like, the constant volume body is usually the main storage space of oil gas, and whether higher crude oil yield can be obtained by reservoir acid fracturing modification usually depends on whether the constant volume body is communicated with surrounding oil-containing oil. However, due to the influence of factors such as lithology, structure and corrosion of carbonate rock oil and gas reservoirs, the distribution of the constant volume body has high uncertainty, so that the distribution of oil and gas has high dispersity and heterogeneity, further the instability of oil and gas production is caused, and once the crude oil production in the constant volume body of oil well communication is finished, the yield of the oil well can be rapidly reduced and approaches to 0. Therefore, the carbonate reservoir needs to be subjected to more yield-increasing transformation so as to continuously communicate with dispersed oil storage volume-fixing bodies and stabilize the productivity.
At present, the identification precision of the seismic exploration technology is about more than 30m, and the size of a constant volume body in a carbonate reservoir is generally lower than the identification precision, so that more constant volume bodies cannot be used for effectively identifying the azimuth, the depth and the longitudinal and transverse scales through the seismic exploration technology. The oil well acid fracturing reconstruction lacks reference, and only a general fracturing reconstruction mode can be adopted for a target layer, so that the communication of a volume-fixed body has high randomness, the effective development proportion is low, and the yield and the recovery rate of crude oil are greatly influenced.
At present, most of existing volume-fixed body identification methods are based on seismic exploration data, and complex data processing and calculation methods are applied to improve identification accuracy, but the problem of identification accuracy of seismic exploration cannot be compensated.
Disclosure of Invention
One of the technical problems to be solved by the present invention is to provide a solution with high detection precision, which can effectively identify the distribution azimuth, depth and vertical and horizontal scales of the oil-containing fixed volume around the shaft.
In order to solve the above technical problem, embodiments of the present application first provide a method for detecting an oil-containing volumetric body in a carbonate reservoir by using radioactive oleophilic particles, the method comprising: in the acid fracturing modification process, mixing a detection solution and injecting the detection solution into a shaft to perform acid fracturing on a carbonate reservoir, wherein the detection solution contains radioactive oleophilic particles; measuring the radioactivity intensity distribution of the radioactive oleophilic particles around the wellbore when the oil well production drops below the industrial oil flow; and identifying the distribution azimuth, depth and longitudinal and transverse scales of the oil-containing constant volume in the carbonate reservoir according to the measured radioactivity intensity distribution result.
In one embodiment of the present invention, there is further included a step of preparing a probe solution, the step further including: coating a lipophilic layer on the radioactive particles to prepare radioactive lipophilic particles; and dissolving the radioactive oleophilic particles in a fracturing fluid to prepare the detection solution.
In one embodiment of the present invention, the radioactive microparticles are made using one of technetium, promethium, americium, curium, berkelium, californium, fermium, mendelevium, nobelium, lawrencium radioactive element synthesized using an artificial nuclear reaction mixed with a polymer-like substance.
In an embodiment of the present invention, the step of identifying the distribution azimuth, depth and vertical and horizontal scales of the oil-containing volumetric body in the carbonate reservoir according to the measured radioactivity intensity distribution result includes: plotting the measured radioactivity data into an oil-containing volumetric body distribution three-dimensional graph; and identifying the distribution azimuth, depth and longitudinal and transverse scales of the oil-containing constant volume in the carbonate reservoir based on the drawn oil-containing constant volume distribution three-dimensional graph.
In one embodiment of the present invention, the step of plotting the measured radioactivity data into a three-dimensional distribution map of the oil-containing volumetric body comprises: based on the well depth values measured at different depth positions of the shaft and the radioactivity values of the detection solution injected in the range of 360 degrees around the shaft wall, calculating the space distance and the shape size of the radioactive source and the measured shaft by a space superposition and inversion algorithm; and drawing according to a specific scale to form a three-dimensional graph, wherein the radioactive source in the three-dimensional graph is the distribution of the oil containing volumetric body around the shaft.
In one embodiment of the invention, the distribution azimuth, depth and vertical and horizontal scales of the oil-containing fixed volume in the carbonate reservoir are identified through the following steps, the distribution azimuth and depth of the oil-containing fixed volume can be obtained through the well depth and azimuth data coordinates on the three-dimensional map, and the vertical and horizontal scales of the oil-containing fixed volume can be further estimated by combining with the scale of the three-dimensional map.
In one embodiment of the present invention, further comprising: and selecting an oil-containing volumetric body to be developed according to the detection result, carrying out acid fracturing modification by adopting a method of directional fracturing and/or adding a temporary plugging agent to change the direction of a crack, communicating the new oil-containing volumetric body to form productivity, and remixing the detection solution in the acid fracturing modification process and injecting the detection solution into the shaft to carry out acid fracturing on the carbonate reservoir.
In one embodiment of the present invention, further comprising: when the oil well yield after at least two times of acid fracturing development is reduced to be lower than the industrial oil flow, the radioactivity intensity distribution of the radioactive oleophilic particles around the shaft is measured again, and the distribution direction, the depth and the vertical and horizontal scales of the oil-containing volumetric body which is not communicated after the at least two times of fracturing development are identified according to the measured radioactivity intensity distribution result; and selecting the oil-containing volumetric body to be developed according to the detection result, performing acid fracturing, and communicating the new oil-containing volumetric body to form productivity.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
according to the method provided by the embodiment of the invention, the oleophylic characteristic of the radioactive oleophylic particles is utilized, the radioactive oleophylic particles are dissolved in fracturing fluid for acid fracturing reconstruction, the radioactive oleophylic particles are diffused into constant volume crude oil formed by karst caves around a shaft along stratum microcracks, after the yield of an oil well is reduced, the distribution position of the oil-containing karst caves is detected by measuring the radioactive distribution around the shaft, and then the subsequent acid fracturing operation is guided to reconstruct and develop the corresponding oil-containing constant volume body. The method is simple, convenient and feasible, low in cost, accurate and reliable, can help the oil field to accurately detect and identify the distribution condition of the oil-containing volumetric body in the carbonate reservoir, further adopts methods of directional fracturing, adding a temporary plugging agent to change the direction of a crack and the like, efficiently and accurately communicates and develops the oil-containing volumetric body, and improves the yield of an oil well and the recovery ratio of crude oil.
The method for detecting the oil-containing volumetric body in the carbonate reservoir by using the radioactive oleophylic particles has the following advantages:
(1) compared with the existing seismic exploration method, the method does not need seismic exploration, avoids the processes of exciting and recording seismic waves, acquiring mass seismic data, processing and calculating mass data, greatly reduces the complexity, and is more simple and easy to implement in actual production.
(2) Compared with the current seismic exploration method, the method has high detection precision, can effectively identify the distribution azimuth, depth and longitudinal and transverse scales of the oil-containing volumetric body around the shaft, and can provide powerful reference for subsequent acid fracturing reconstruction because the identified oil-containing volumetric body is the oil-containing volumetric body.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure and/or process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technology or prior art of the present application and are incorporated in and constitute a part of this specification. The drawings for illustrating the embodiments of the present application together with the embodiments of the present application serve to explain the technical solutions of the present application, but do not limit the technical solutions of the present application.
FIG. 1 is a schematic flow chart illustrating a method for detecting an oil-containing volumetric body in a carbonate reservoir using radioactive oleophilic particles according to an embodiment of the present disclosure.
FIG. 2 is a schematic diagram of an embodiment of the present application for detecting oil-containing fixed volume in a carbonate reservoir using radioactive oleophilic particles.
Fig. 3 is a schematic diagram of three-dimensional distribution of oil-containing volumetric bodies in a carbonate reservoir according to an embodiment of the present application.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the drawings and embodiments, so that how to apply technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The features of the embodiments and examples of the present invention may be combined without conflict, and the technical solutions formed are all within the scope of the present invention.
The fixed volume body is a main storage space of the carbonate reservoir, but due to the influences of factors such as lithology, structure and corrosion, the distribution of the fixed volume body has higher uncertainty, so that the communication of the fixed volume body in the acid fracturing modification process of the carbonate reservoir has higher randomness and lower effective development proportion, and the instability of oil and gas production is caused. At present, the mainstream seismic exploration method is limited by identification precision, so that most of volume-determining bodies cannot be identified and positioned. If the azimuth, depth and longitudinal and transverse scales of the fixed volume in the carbonate reservoir can be accurately detected, the method can realize effective communication of the fixed volume around an oil well, stabilize oil and gas yield and improve the recovery ratio by applying methods such as directional fracturing and adding a temporary plugging agent to change the direction of cracks in the acid fracturing modification process. Therefore, aiming at the problems that the existing mainstream seismic exploration method is insufficient in the precision of identifying the fixed volume and the actual requirement for efficient development of carbonate reservoirs, the invention provides the oil-containing fixed volume detection method which is simple and easy to implement and high in identification precision and accuracy.
The basic principle of the invention is illustrated below: and coating an oleophilic layer on the radioactive particles, dissolving the radioactive oleophilic particles in fracturing fluid in the process of carrying out acid fracturing modification on the carbonate reservoir development well, and injecting the fracturing fluid into a shaft to carry out acid fracturing on the carbonate reservoir. The radioactive oleophylic particles enter a reservoir stratum along with the fracturing fluid to communicate and expand natural fractures, and due to oleophylic characteristics of the radioactive oleophylic particles, the radioactive oleophylic particles are adsorbed to crude oil in the fractures from the fracturing fluid, gradually diffuse to a surrounding reservoir stratum along the fractures from the crude oil, and finally enter an oil-containing karst cave constant volume body around a shaft. After the yield of the oil well is reduced, a radioactivity detection device is put into the shaft to measure the specific radioactivity around the shaft from top to bottom, and the measured radioactivity distribution data is processed by surface software to accurately detect and identify the distribution position, depth and longitudinal and transverse scales of the oil-containing constant volume body in the carbonate reservoir.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a schematic flow chart illustrating a method for detecting an oil-containing volumetric body in a carbonate reservoir using radioactive oleophilic particles according to an embodiment of the present disclosure.
First, in step S110, a detection solution for detecting an oil-containing volumetric body in a carbonate reservoir is prepared.
Specifically, the radioactive particles are coated with an oleophilic layer to prepare radioactive oleophilic particles, and then the radioactive oleophilic particles are dissolved in fracturing fluid to prepare a detection solution.
Note that the radioactive microparticle may be prepared by mixing any one of radioactive elements such as technetium, promethium, americium, curium, berkelium, californium, einsteinium, fermium, mendeleum, nobelium, lawrencium, and the like, which are synthesized by artificial nuclear reaction, with a polymer substance or the like. The radioactive element of the artificial nuclear reaction is used, so that the influence of natural radioactive elements in a later-period measurement layer is avoided, and the accuracy of radioactive measurement is effectively improved. In addition, various methods such as dip coating may be used for the preparation of the oleophilic layer coated on the radioactive particles, other than spray coating, and the present invention is not limited thereto.
It should be noted that, when the detection solution is prepared, it is necessary to ensure that the radioactivity of the final solution is greater than the lower limit of the radioactivity detected by the detection instrument, and ensure that the detection instrument can measure radioactivity data after the immersed fracturing fluid diffuses in the formation. In addition, the fine particle powder may be dissolved in the fracturing fluid, or the slurry may be diluted with the fracturing fluid.
It is readily understood that in order to achieve the objects of the present invention, the prepared detection solution can be used in advance to detect the oil-containing volumetric body in the carbonate reservoir, and this step may not be performed as long as the obtained detection solution has radioactivity and lipophilicity.
In step S120, in the acid fracturing process, the probe solution is mixed and injected into the wellbore to perform acid fracturing modification on the carbonate reservoir.
In step S130, the radioactivity intensity distribution of the radioactive oleophilic particles around the wellbore is measured as the well production drops below the industrial oil flow.
In one example, after acid fracturing is completed, the well is sealed for 1-3 days, and the oleophilic particles are adsorbed to crude oil from the fracturing fluid in the fracture and gradually diffuse to the surrounding cavern volume containing oil in the crude oil in the fracture. And opening the well, open-blowing, performing fracturing fluid flowback, and then normally performing production development. As development progresses, the production of the carbonate reservoir well gradually decreases below the flow of industrial oil, production is stopped, and a radioactivity detecting device is lowered into the well bore of the well to measure the specific radioactivity around the well bore from top to bottom. As shown in fig. 2, the radioactivity detecting device 1 is lowered to measure the radioactivity intensity distribution of the radioactive oleophilic particles around the wellbore. In the measuring process, besides the top-down measurement, the radioactivity of the lipophilic particles can be measured from the bottom up, such as the radioactivity of one of the artificial radioactive elements.
In step S140, the distribution azimuth, depth and vertical and horizontal scales of the oil-containing volumetric body in the carbonate reservoir are identified according to the measured radioactivity intensity distribution result.
As shown in FIG. 2, during the measurement, the radioactivity detecting device 1 transmits the measured radioactivity data to the surface processor 3 via the cable 2, and after processing, the measured radioactivity data is drawn into a three-dimensional oil-containing volumetric body distribution map (as shown in FIG. 3) in the computer 4.
The distribution, the azimuth and the vertical and horizontal scales of the oil-containing constant volume around the well carbonate reservoir can be accurately identified by the drawn oil-containing constant volume distribution three-dimensional graph.
More specifically, the radioactive oleophilic particles are adsorbed in crude oil in the oil-containing volumetric body to form a radioactive source, the spatial distance and the shape of the radioactive source and the measured shaft are calculated through a series of spatial superposition and inversion algorithms based on the well depth values measured at different depth positions of the shaft and the radioactive values of the injected detection solution within 360 degrees around the shaft wall, a three-dimensional graph is drawn according to a specific scale to form, the radioactive source in the three-dimensional graph is the distribution of the oil-containing volumetric body around the shaft, the distribution azimuth and the depth of the oil-containing volumetric body can be obtained through the well depth and the azimuth coordinates on the three-dimensional graph, and the vertical scale of the oil-containing volumetric body can be further estimated by measuring the three-dimensional size of the radioactive source in combination with the scale of the three-dimensional graph.
In addition, in step S150, an oil-containing volume-fixed body to be developed is selected according to the detection result, acid fracturing is performed by adopting methods such as directional fracturing and/or adding a temporary plugging agent to change the direction of a fracture, and the new oil-containing volume-fixed body is communicated to form productivity, and the detection solution is mixed again and injected into the wellbore to perform acid fracturing on the carbonate reservoir during the acid fracturing modification process.
In order to more effectively improve the recovery rate, when the yield of the oil well after at least two times of acidizing and fracturing development is reduced to be lower than the industrial oil flow, the radioactivity intensity distribution of the radioactive oleophilic particles around the shaft is measured again, and the distribution direction, the depth and the vertical and horizontal scales of the oil-containing volumetric body which is still not communicated after the at least two times of fracturing development are identified according to the measured radioactivity intensity distribution result; and selecting the oil-containing volumetric body to be developed according to the detection result, carrying out acid fracturing, and communicating the new oil-containing volumetric body to form the productivity.
A specific example of using radioactive oleophilic particles to detect oil-containing volumetric bodies in a carbonate reservoir in a northbound X-well is described below.
(1) Spraying an oleophilic layer on the radioactive particles to prepare radioactive oleophilic particles;
(2) dissolving the radioactive oleophilic particles in fracturing fluid to prepare detection solution;
(3) injecting a mixed detection solution into a shaft in the north X well acidizing and fracturing to perform acid fracturing modification on a carbonate reservoir;
(4) closing the shaft for 1-3 days after the acid fracturing is finished, and allowing the radioactive oleophilic particles to be adsorbed into the crack crude oil and fully diffused in the stratum;
(5) opening a well, open-blowing, performing fracturing fluid flowback, and developing and producing along a north X well;
(6) after a period of development, after the crude oil in the oil-containing constant volume body communicated with the artificial large cracks formed by the first fracturing of the north X well is completely extracted, the yield of the oil well is gradually reduced to be below the industrial oil flow, and the well is shut down and stops production;
(7) a radioactivity detecting device is put into a well shaft of the northward X well, the specific radioactivity of the stratum around the well shaft is measured from top to bottom, the radioactivity data is transmitted to the ground, and the detecting device is taken out of the well shaft after the measurement is finished;
(8) the radioactive data is processed by a processor and then drawn into a three-dimensional oil-containing volumetric body distribution diagram by a computer, and the distribution azimuth, depth and longitudinal and transverse scales of the oil-containing volumetric body can be identified according to the proportional size of a shaft in the diagram.
(9) And (3) according to the distribution condition of the detected oil-containing volumetric body, adopting methods of directional fracturing, adding a temporary plugging agent to change the direction of the fracture and the like, repeating the steps (2) - (5) to carry out secondary acidizing fracturing on the northward X well, controlling the artificial fracture to communicate with a new oil-containing volumetric body to form productivity, and carrying out a new round of development.
(10) And (5) repeating the steps (6) - (9) after the productivity of the northward X well is reduced again, detecting the oil-containing capacity-determining body which is still not communicated by the first fracturing and the second fracturing, and carrying out acid fracturing communication and development for the third time.
The embodiment of the invention provides a method for detecting oil-containing karst cave constant volume bodies in a reservoir by using radioactive oleophilic particles in complex reservoirs mainly comprising carbonate karst cave reservoirs such as northward oil fields and Tahe oil fields. More specifically, based on the oleophylic property and radioactivity of the radioactive oleophylic particles, the radioactive oleophylic particles are mixed with fracturing fluid to prepare detection solution which is injected into a stratum for fracturing in the oil well acid fracturing modification process, and the oleophylic property of the radioactive oleophylic particles is utilized to ensure that the radioactive oleophylic particles are adsorbed to crude oil by the fracturing fluid in the fractures and gradually diffuse into a surrounding oil-containing karst cave constant volume body in the crude oil in the fractures; when the yield of the oil well is reduced to be lower than the industrial oil flow, a detection instrument is put into the oil well shaft by utilizing the radioactivity of the oil well, the radioactivity intensity distribution of the radioactive oleophilic particles around the shaft is detected and recorded from top to bottom, an oil-containing volumetric body distribution detection three-dimensional graph is further formed by drawing after ground treatment, and the distribution direction, the depth, the longitudinal and transverse scales and the communication exploitation conditions of the oil-containing volumetric body in the carbonate rock reservoir around the shaft are judged. The method is simple, convenient and feasible, low in cost, accurate and reliable, can help the oil field to accurately detect and identify the distribution condition of the oil-containing volumetric body in the carbonate reservoir, and adopts methods of directional fracturing, adding a temporary plugging agent to change the direction of a crack and the like to efficiently and accurately communicate and develop the oil-containing volumetric body, thereby improving the yield of an oil well and the recovery ratio of crude oil.
Although the embodiments of the present invention have been described above, the above description is only for the purpose of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A method of detecting a volumetric body in a carbonate reservoir using radioactive oleophilic particles, the method comprising:
in the acid fracturing modification process, mixing a detection solution and injecting the detection solution into a shaft to perform acid fracturing on a carbonate reservoir, wherein the detection solution comprises radioactive oleophilic particles;
measuring the radioactivity intensity distribution of the radioactive oleophilic particles around the well bore when the oil well production is reduced below the industrial oil flow;
identifying the distribution azimuth, depth and longitudinal and transverse scales of the oil-containing constant volume body in the carbonate reservoir according to the measured radioactivity intensity distribution result;
the method further comprises the step of preparing a probe solution, which further comprises:
preparing radioactive microparticles from radioactive elements synthesized based on artificial nuclear reaction, and coating an oleophilic layer on the radioactive microparticles to prepare radioactive oleophilic microparticles;
dissolving the radioactive oleophilic particles in a fracturing fluid to prepare the detection solution;
in the process of identifying the distribution azimuth, depth and longitudinal and transverse scales of the oil-containing constant volume body in the carbonate reservoir, the method comprises the following steps:
plotting the measured radioactivity data into an oil-containing volumetric body distribution three-dimensional graph; and
identifying the distribution azimuth, depth and vertical and horizontal scales of the oil-containing constant volume in the carbonate reservoir based on the drawn oil-containing constant volume distribution three-dimensional graph;
wherein, the measured radioactivity data is drawn into an oil-containing volumetric body distribution three-dimensional graph through the following operations:
based on the well depth values measured at different depth positions of the shaft and the radioactivity values of the detection solution injected in the range of 360 degrees around the shaft wall, the space distance and the shape size of the radioactive source and the measured shaft are calculated;
drawing according to a specific scale to form a three-dimensional graph; wherein, the radioactive sources in the three-dimensional graph are the distribution of oil-containing volumetric bodies around the shaft.
2. The method of claim 1, wherein said radioactive microparticle is prepared using one of technetium, promethium, americium, curium, berkelium, californium, einsteinium, fermium, mendeleum, nobelium, lawrencium radioactive element mixed with a polymeric species.
3. The method of claim 1, wherein in the step of plotting the measured radioactivity data into a three-dimensional distribution map of the oil-containing volumetric body, the spatial distance and shape between the radioactive source and the measuring shaft bore are calculated by spatial superposition and inversion algorithm after the well depth value and the radioactivity value of the injected detection solution within 360 ° around the shaft wall are obtained.
4. The method of claim 3, wherein the orientation, depth and vertical and horizontal dimensions of the oil-containing volumetric body in the carbonate reservoir are identified by,
the distribution azimuth and the distribution depth of the oil-containing volumetric body can be obtained through the well depth and the azimuth data coordinates on the three-dimensional graph, and the vertical and horizontal scales of the oil-containing volumetric body can be further estimated by combining a scale of the three-dimensional graph.
5. The method according to any one of claims 1 to 4, further comprising:
and selecting an oil-containing volumetric body to be developed according to the detection result, carrying out acid fracturing modification by adopting a method of directional fracturing and/or adding a temporary plugging agent to change the direction of a crack, communicating the new oil-containing volumetric body to form productivity, and remixing the detection solution in the acid fracturing modification process and injecting the detection solution into the shaft to carry out acid fracturing on the carbonate reservoir.
6. The method of claim 5, further comprising:
when the oil well yield after at least two times of acid fracturing development is reduced to be lower than the industrial oil flow, the radioactivity intensity distribution of the radioactive oleophilic particles around the shaft is measured again, and the distribution direction, the depth and the vertical and horizontal scales of the oil-containing volumetric body which is not communicated after the at least two times of fracturing development are identified according to the measured radioactivity intensity distribution result;
and selecting the oil-containing volumetric body to be developed according to the detection result, carrying out acid fracturing, and communicating the new oil-containing volumetric body to form the productivity.
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